Southernrelics, I see you are relatively a newcomer to TreasureNet (29 posts at the moment). So here's a friendly heads-up. The What-Is-it forum's atmosphere is generally more "scholarly" than other T-Net categories, but it too has its Humor contingent. Please do not feel insulted when somebody seems to reply jokingly to a What-Is-It request. (I'm not sure whether Crispin was joking, or not.)
Your finds which you say "ring low silver on my ATPro" are of course not teeth. They appear to be either a metal-based concretion or perhaps metal "slag," or coal-clinkers.